Brake problems on 94
Drifting
Joined: Feb 2008
Posts: 1,537
Likes: 177
From: NE Ohio
2024 C4 of the Year Finalist - Unmodified
Not sure . had it in shop for other work and they picked up on it. Called and said the calipers were bad. Told them to change them and almost put myself through the windshield on the way home. The were not grabbing
Instructor
Joined: Aug 2025
Posts: 181
Likes: 21
From: north central Iowa
1994 brakes
I've replaced my booster, and the check valve, but don't know how to judge my vacuum. Also, I've not been able to locate the fuse for my ABS system, to pull and see if there's any difference, but I have no codes or anything pointing to an ABS problem. Still, I haven't been able to rule out a faulty ABS system. Can someone tell me where the ABS fuse is? I looked online with no luck. Plus,does anyone know how to test vacuum efficacy? The only other thing I know to do that I haven't done is to replace brake lines.I see nothing wrong with my lines. Calipers have just been lubed, when I replaced rotors and pads. Master cylinder is new also. Maybe this vacuum is my trouble. How to tell?
Thread Starter
7th Gear
Joined: Feb 2026
Posts: 7
Likes: 3
The problem is solved!!!! After replacing the brake booster with aftermarket Chinese POS, with no change to the braking I have purchased a rebuilt original booster, installed it and the breakes worked great. After chasing this problem for months my recommendation is stay as far away from the aftermarket boosters as you can and have yours rebuilt.
